import * as fs from 'fs';

import * as path from 'path';

export function parseEnvFile(envFile: string): any {

const buffer = fs.readFileSync(envFile, 'utf8');

const env = {};

buffer.split('\n').forEach(line => {

const r = line.match(/^\s*([\w\.\-]+)\s*=\s*(.*)?\s*$/);

if (r !== null) {

let value = r[2] || '';

if (value.length > 0 && value.charAt(0) === '"' && value.charAt(value.length - 1) === '"') {

value = value.replace(/\\n/gm, '\n');

}

env[r[1]] = value.replace(/(^['"]|['"]$)/g, '');

}

});

return mergeEnvVariables(env);

}

export function mergeEnvVariables(newVariables: { [key: string]: string }, mergeWith: any = process.env): any {

for (let setting in mergeWith) {

if (setting === 'PYTHONPATH') {

let PYTHONPATH: string = newVariables['PYTHONPATH'];

if (typeof PYTHONPATH !== 'string') {

PYTHONPATH = '';

}

if (mergeWith['PYTHONPATH']) {

PYTHONPATH += (PYTHONPATH.length > 0 ? path.delimiter : '') + mergeWith['PYTHONPATH'];

}

if (PYTHONPATH.length > 0) {

newVariables[setting] = PYTHONPATH;

}

continue;

}

if (!newVariables[setting]) {

newVariables[setting] = mergeWith[setting];

}

}

return newVariables;

}